local u = require("utils")

vim.o.completeopt = "menuone,noselect"

require"compe".setup {
  enabled = true,
  autocomplete = true,
  debug = false,
  min_length = 1,
  preselect = "enable",
  throttle_time = 80,
  source_timeout = 200,
  incomplete_delay = 400,
  max_abbr_width = 100,
  max_kind_width = 100,
  max_menu_width = 100,
  documentation = true,

  source = {path = true, nvim_lsp = true, buffer = true, calc = true, nvim_lua = true}
}

local t = function(str) return vim.api.nvim_replace_termcodes(str, true, true, true) end

local check_back_space = function()
  local col = vim.fn.col(".") - 1
  if col == 0 or vim.fn.getline("."):sub(col, col):match("%s") then
    return true
  else
    return false
  end
end

-- Use (s-)tab to:
--- move to prev/next item in completion menuone
--- jump to prev/next snippet's placeholder
_G.tab_complete = function()
  if vim.fn.pumvisible() == 1 then
    return t "<C-n>"
    -- elseif vim.fn.call("vsnip#available", {1}) == 1 then
    -- 	return t "<Plug>(vsnip-expand-or-jump)"
  elseif check_back_space() then
    return t "<Tab>"
  else
    return vim.fn["compe#complete"]()
  end
end
_G.s_tab_complete = function()
  if vim.fn.pumvisible() == 1 then
    return t "<C-p>"
    -- elseif vim.fn.call("vsnip#jumpable", {-1}) == 1 then
    -- return t "<Plug>(vsnip-jump-prev)"
  else
    return t "<S-Tab>"
  end
end

u.keymap("i", "<Tab>", "v:lua.tab_complete()", {expr = true})
u.keymap("s", "<Tab>", "v:lua.tab_complete()", {expr = true})
u.keymap("i", "<S-Tab>", "v:lua.s_tab_complete()", {expr = true})
u.keymap("s", "<S-Tab>", "v:lua.s_tab_complete()", {expr = true})
u.keymap("i", "<Tab>", "v:lua.tab_complete()", {expr = true})
u.keymap("i", "<C-Space>", "compe#complete()", {expr = true})
u.keymap("i", "<CR>", [[compe#confirm('<CR>')]], {expr = true})

-- inoremap <silent><expr> <C-Space> compe#complete()
-- inoremap <silent><expr> <CR>      compe#confirm('<CR>')
-- inoremap <silent><expr> <C-e>     compe#close('<C-e>')
-- inoremap <silent><expr> <C-f>     compe#scroll({ 'delta': +4 })
-- inoremap <silent><expr> <C-d>     compe#scroll({ 'delta': -4 })
